//////////////////////////////////////////////////////////////////////////
//
//  Copyright (c) 2020, Image Engine Design Inc. All rights reserved.
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//////////////////////////////////////////////////////////////////////////

#include "GafferScene/ShuffleAttributes.h"

using namespace IECore;
using namespace Gaffer;
using namespace GafferScene;

GAFFER_NODE_DEFINE_TYPE( ShuffleAttributes );

size_t ShuffleAttributes::g_firstPlugIndex = 0;

ShuffleAttributes::ShuffleAttributes( const std::string &name )
	:	AttributeProcessor( name )
{
	storeIndexOfNextChild( g_firstPlugIndex );
	addChild( new ShufflesPlug( "shuffles" ) );
}

ShuffleAttributes::~ShuffleAttributes()
{
}

Gaffer::ShufflesPlug *ShuffleAttributes::shufflesPlug()
{
	return getChild<Gaffer::ShufflesPlug>( g_firstPlugIndex );
}

const Gaffer::ShufflesPlug *ShuffleAttributes::shufflesPlug() const
{
	return getChild<Gaffer::ShufflesPlug>( g_firstPlugIndex );
}

bool ShuffleAttributes::affectsProcessedAttributes( const Gaffer::Plug *input ) const
{
	return AttributeProcessor::affectsProcessedAttributes( input ) || shufflesPlug()->isAncestorOf( input );
}

void ShuffleAttributes::hashProcessedAttributes( const ScenePath &path, const Gaffer::Context *context, IECore::MurmurHash &h ) const
{
	if( shufflesPlug()->children().empty() )
	{
		h = inPlug()->attributesPlug()->hash();
	}
	else
	{
		AttributeProcessor::hashProcessedAttributes( path, context, h );
		shufflesPlug()->hash( h );
	}
}

IECore::ConstCompoundObjectPtr ShuffleAttributes::computeProcessedAttributes( const ScenePath &path, const Gaffer::Context *context, const IECore::CompoundObject *inputAttributes ) const
{
	if( shufflesPlug()->children().empty() || inputAttributes->members().empty() )
	{
		return inputAttributes;
	}

	CompoundObjectPtr result = new CompoundObject;
	result->members() = shufflesPlug()->shuffle<CompoundObject::ObjectMap>( inputAttributes->members() );

	return result;
}
